Reactivity of α-Bromosulfones Obtained from<i>gem</i>-Dibromides
作者:Niels Münster、Laura Werel、Georg Alexander Rennar、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201501136
日期:2015.12
α-Bromosulfones have been synthesized diastereoselectively by reaction of β-hydroxy gem-dibromides with aromatic sulfinates. More steric demanding groups in the β-position led to increased stereoselectivity in these SN2 reactions. Lithiated α-bromosulfones react diastereoselectively with alkylating agents, aldehydes, and ketones. No configurational stability of the lithiated α-bromosulfones was observed
Differentiation of diastereotopic bromine atoms in SN2 reactions of gem-dibromides
作者:Niels Münster、Klaus Harms、Ulrich Koert
DOI:10.1039/c2cc17599a
日期:——
A novel directed S(N)2 reaction of conformationally biased gem-dibromides and an arenesulfinate anion is described. The reaction results in the diastereoselective formation of alpha-bromosulfones. The selectivity originates from pre-coordination of the nucleophile to a free hydroxyl group in the gamma-position.